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Product short description:
  • Active-Low Inputs, Sinking Outputs (Low-Side Switching)
  • 12 input and/or 12 output channels
  • 0 to 35V DC I/O range
  • 10 to 36V DC, 24V AC power
  • Modbus-RTU high-speed RS-485
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These modules provide twelve discrete input and/or output channels. Isolation separates the I/O, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus-RTU protocol. Both AC and DC power sources are supported with wide range, non-polarized, diode-coupled terminals.

The open-drain outputs are intended for current-sinking or low-side switching applications. The buffered inputs are active-low. These models are the complement of the 904, 905, and 906 units which have open-source, high-side output switches and active-high inputs. Socketed pull-up resistors are easily removed or exchanged to satisfy your application requirements.

Combining flexible I/O types, wide I/O ranges, and a network interface in a single package, makes this instrument extremely powerful. Multi-channel design adds cost-efficiency and allows high-density mounting. Plus, safe, rugged construction makes these modules reliable for use in both control room and distributed field I/O applications. Custom module configurations are also possible (consult factory for details).

  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
  • High-voltage, high-current, open-drain outputs enable direct (low-side) control of external devices
  • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
  • Tandem input/output circuitry (903 models only) connects input buffers with open-drain outputs for convenient loop-back monitoring of the output state
  • Outputs have built-in over-temperature and over-current shut-down protection, plus active clamping circuits for switching inductive loads
  • Watchdog timers provide a configurable fail-safe output state for use when host I/O communication is lost
  • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
  • Self-diagnostics monitor micro controller activity to detect operational failures (lock-up) and execute a reset to restore communication
  • Operating temperature: -25°C to 70°C (-13°F to 158°F)

Manuals

901MB, 902MB, 903MB User Manual (Log in to download the file)

BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file)
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    Terminal Block Replacements

    • Simplifies wiring connections on Acromag I/O Modules
    • Barrier strip or spring clamp terminal block kits
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    USB Cables

    Various USB cables
    $10$15
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Additional information

Weight 16 oz
Dimensions 12 × 13 × 3 in
Part Number

4001-112: ,Type A to Type B, 4001-113: Type A to Mini-B, 5028-565: Micro USB to USB OTG, 4001-095: USB-to-DB9

  • Description

  • Features & Benefits

    • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
    • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
    • High-voltage, high-current, open-drain outputs enable direct (low-side) control of external devices
    • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
    • Tandem input/output circuitry (903 models only) connects input buffers with open-drain outputs for convenient loop-back monitoring of the output state
    • Outputs have built-in over-temperature and over-current shut-down protection, plus active clamping circuits for switching inductive loads
    • Watchdog timers provide a configurable fail-safe output state for use when host I/O communication is lost
    • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
    • Self-diagnostics monitor micro controller activity to detect operational failures (lock-up) and execute a reset to restore communication
    • Operating temperature: -25°C to 70°C (-13°F to 158°F)
  • Specs & Data Sheets

    Manuals

    901MB, 902MB, 903MB User Manual (Log in to download the file)

  • Software

    BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file)
  • Accessories

    • Compare

      900C-SIP: Configuration Software Interface Package

      • Configuration Software
      • USB-to-RS232 Adapter
      • RS232-to-RS485 Adapter
      • Interface Cable
      $320
      Read more
    • Compare

      PS5R: Slim Line Power Supplies

      • 10W, 15W, 30W, 60W, 90W, 120W, and 240W models
      • Universal Input (85-264V AC / 100-370V DC)
      • Lightweight and compact size
      $95$245
      Select options
    • Compare

      Terminal Block Replacements

      • Simplifies wiring connections on Acromag I/O Modules
      • Barrier strip or spring clamp terminal block kits
      • Provide safe and secure wiring connections
      $25$35
      Read more
    • Compare

      USB Cables

      Various USB cables
      $10$15
      Select options
  • Additional information

    Additional information

    Weight 16 oz
    Dimensions 12 × 13 × 3 in
    Part Number

    4001-112: ,Type A to Type B, 4001-113: Type A to Mini-B, 5028-565: Micro USB to USB OTG, 4001-095: USB-to-DB9